Straight air emergency valve device



Sept. 22,1931. C 1,824,053

STRAIGHT AIR EMERGENCY VALVE DEVICE Filed April 1, 1929 Fig-.1

INVENTOR JOSEPH QMCCUNE ATTO EY Patented Sept. 22, 1931 UNITED STATES.

PATENT OFFICE JOSETPHI O. MCG'UNE, F IElIDG-EWOOI), PENNSYLVANIA,ASSIGNOR TO THE WESTINGHOUSE AIR BRAKE COMPANY, OF

PENNSYLVANIA I WILMEBDING, PENNSYLVANIA, A CORPORATION OF 7 STRAIGHT AIRnunaGENcrvALvE DEVICE Application filed April 1, 1929. Serial No.351,495.

This invention relates to fluid pressure brake equipments and moreparticularly todirectly control the discharge of fluid under pressurefrom the brake cylinder in eflect- 1 ing the release of the brakes aftersuch applications. Since the emergency portion of this type of emergencyvalve devicecannot operate to supply fluid under pressure directly tothe brake cylinder, and such supply is wholly dependent upon theoperation of the application portion, failure of sai application portionto operate'to application position when it isdesired to effect anemergency application of the brakes, will prevent 2 the desired supplyoffluid under pressure to the brake cylinder even though the emer- P gencyportion does operate to its emergency position, so that the brakes couldnot be applied to retard the movement of the car. 30.

provide an improved emergency valve device of the above type which willbe free from the objectionable feature just described in connection withthe emergency valve devices heretofore used. 1

Another object of my invention is to pro vide an improved emergencyvalve device having an application portion and an emergency portion,eitheror both of which are 49 operative to supply fluid underpressure tothe brake cylinder to eflect an emergency application of the brakes.Another object of my invention is to provide an improved emergency valvedevice having an application portion and an emergency portion forcontrolling the application and release of the brakes, and in which theemergency portion is adapted'to control the discharge of fluid underpressure from the effecting both service and 2 The principal object ofmy invention'is to is a fluid normally brake cylinder in effecting therelease of the brakes. I

A further object of my invention is to provide an improved emergencyvalve device having an application portion and an emer gency portioneither or both of which are operative tocontrol the opening and closingof communication from the brake cylinder to the atmosphere;

Other objects and advantages will appear in the following more detaileddescription of my invention. V

In the accompanying drawings, Fig. 1 is a diagrammatic View, mainly insection, of a portionof a brake equipment having an emergency valvedevice embodying my invention; and Fig. 2 is a'development view of thebrake valve device.

As shown in the accompanying drawings, my improved emergency valvedevice comd prises an emergency portion 1 and an application portion 2.e

The emergency portion 1 may comprise a casing having a chamber 3connected to an emergency pipe 4 through a passage and ipe 5 andcontaining an emergency piston 6 which is adapted to operate anemergency slide valve 7 contained in a chamber 8, said chambers 3 and 8being connected together, when the emergency piston is in releaseposition, through the usual feed groove 9.

The application portion 2'may comprise a casing having a chamber 10containing an application piston 11 which is adapted to operate a slidevalve 12 contained in a chamber 13 which is connected to a brakecylinder 14 through a passage and pipe 15. The passage 15 also leadsfrom the seat of the emergency slide valve 7.

Contained in a chamber 16, in the application portion 2, which isconnected to a reservoir 17 through a passage and pipe 18, pressuresupply valve 19 which is maintained sealed against a seat ring 20,formed on a wall 2101? the casing,

by the pressure of a spring 22. The valve 19 is provided with a flutedstem 23 which extends through 13. Within the valve chamber 13, the endvice 40, emergency pipe l, and pipeand pas;v sage. 5., Since thepressures 1n-1chainbers3 and v8 will be substantially equal, the pres-v.

"theeemergency slide valve ,7- and .com nunicationf from portion-isconstantly connected to the reservoir 17 through the pipe and passage118i and;

the valve chamber 8 in the emergency portion is constantly connected tothe valve chamber 16 through a passage 25.

In initially charging under pressure is supplied to the reservoir 17through a pipe 26 pressure compressor or other pressure supply source,(not shown) to the ,einergencyvalve chamber 8 through pipe and passage18, valve-chamber 16 in the q and passage 25. At the same time fluid 1m:der pressure issupplied ironrthe reservoir 17 to the emergency pistonchamber} through pipe 18, the usual brake valvedesure of a spring 27,containediin the cham 25 ,ber 3, ma1ntains the. emergency pistonandemergency slide valve llrl'illll"lO1VQImOSti,OI'-';

in the drawings,

release positions as shown h With the emergency slide valve? and theapplication slide valve 12 in their release positions, the brakecylinder'li isconnected to the atmosphere 15, application slide valvechamber-13, "past the end of the slide valved-Band through a port28 inthe slide valve 12, a passage 29,

,acavity 30 in the emergency} slide valve 7-;

and passage 31. w a Y Further, with the emergency slide valve? inrelease position, the applicationpiston chamber 10 is connected to-tliestraight air pipe 32 through a passage 83,;a CflVlliYBtlin a passage andpipe 85. With the in release position the, straight air pipe isconnected to the atmospherelin the usual manner through the brakevalvedevice;

With the equipment and the brake cylinder connectedytothe atmosphere, toeffect .a service application of. 82. is'supthe brakes, the straightairv pipe plied with fluid under pressure from the reservoir 17 throughthe pipe 18 and brake valve device in the usual manner, and fluid thepipe to the thus "supplied flows from application piston chamber 10,through pipe and passage 35, cavity 34inthe emergency slide valve 7'andpassage 33. -j

positiomcarrying withit the application the equipment, fluid lead fromfluid.

' 1n valve chamber valvechamber l3 and from thence to the applicationportion 1 present in the application I pressure of fluid in chamber 10,e., when a full serv ce applicathrough pipe and passageof a the brakes,the

brake valve device thus fully charged 1 to the atmosphere through thedev ce in the usual manner, and que'nc'ef',

ee. mi e t Pressure of fluid thus supplied to 1 Straight p 1p 6plication piston chamber 10,causes the apton-chamber is thus discharged,V a v V t v v offluid'in-the application slide slide valve 12 toitsapplication pos tion, in, b which position the slide valve closes oilthe pistomsteni-engages the end of the fluted stem;23 of the supplyvalve 19, and the continned movement of the piston, toward applicationpositiomcauses the valve 19 to be communication through which fluidunder pressure, iron; the reservoir 17, and present 16, flows to theapplication brakecylinder 14 through passage 15.

Now, ivhenrthe brake cylinder pressure,

slide valve chamber '13 becomes substantially equal to the theapplication piston tlOILOf the brakeshasbeen effected, the pressureofsp'ring22 causes the valve 19 to again seat against the seat ring 20.While this valve is moving to its seated position, the end of the flutedstem, being in engagement withihe end 24 of the valve stem, causes theapplication piston 11 and application slide valve 12' tomove in adirection toward the :leftjhand, a distance corresponding to the travel.of.the valve 19, but this movement is not sufiicient to again establishthe coinmuii1cation-Q.-from the. brake cylinder and valve chamber 13 ;totheatmosphere, thus maintaining brake cylinder pressure.

Should it; he desired' to limit the brake cylinder, pressure inelfecting an application pressure of fluid, in the straight. air-pipe32, and consequently in the :application; piston chamber 10, is built upto the desired degree, causing the application ;porti9n 2'to function tosupply fluid underpressureas described in connection with a service-'application of the brakes, until such time asthepressures in thechambers 10 and 13 become 7 v substantially equal, when the valve; 19will be seatedin the manner hereinbeforeclescribedand close off thefurther supplyof fluid under pressure to the brake cylinder 14. I a

To release the brakes after a service applic ation,tthe straight airpipe 32 is vented brake valve as a consetlie'application piston chamber10 is also' ve nted tothe atmosphere, since this through the passage 33,

cavity 34in the emergency slide valve 7 and plication'piston 11 to move"in thejdirection passage and plpe 35' toward the right hand to itsapplication RZ1 j.;.auses the application piston 11 to th T k r d14vreturn toqreleaseposition, as shown in the e ora e 03 11161 ,1;-

drawings, carrying with it the application 'is connected with the 3unseatedffrom the-seafaring 20, against the pressur e-ofthespring 22,thus establishing slidevalve12 to its release position. With the slidevalve 12 returned to release position, it reestablishes thecommunication, through which, fluid under pressure is discharged fromthe brake cylinder 14- to the atmosphere.

To effect an emergency application of the brakes, the emergency pipe lis vented to the atmosphere through the brake valve device in the usualmanner, and as a consequence the emergency piston chamber 3 is alsovented to the atmosphere, since said chamber is connected to the pipe 4by the passage.

and pipe 5. With the piston chamber 3 thus vented, the pressure of fluidin the emergency valve chamber 8, as supplied from the reservoir 17,through pipe and passage 18, valve chamber '16 in the applicationportion and passage 25, causes the emergency piston 6 to move to itsuppermost or emergency posi tion, against the pressure of the spring 27,

carrying with it, the emergency slide valve 7.

W 1th the emergency slide valve 7 in emergency position, a port 36 insaid valve registers with the passage 33, so that fluid under pressureflows from the emergency valve chamber 8 to the application pistonchamber 10, through said port and passage. The pressure thus supplied tothe chamber 10 ,causes the application portion 2 to operate to supplyfluid under pressure from the reservoir 17 to the brake cylinder, and toclose the communication from the brake cylinder 14; and chamber 13 tothepassage 29, in the same manner as described in connection with closedoff. Further, as the emergency slide valve 7 operates to emergencyposition, it uncovers the passage 15, so that fluid under pressure alsoflows from the emergency valve chamber to the brake cylinder by way ofthis passage and pipe 15.

In effecting an emergency application of the brakes, the straight airpipe 32 and pipe and passage 35 are charged with fluid under pressurefrom the reservoir 17 by way of pipe 18 and the brake valve device inthe tion.

. sure is again supplied to the emergency pisplied by the reservoir 17,the pressure of the spring 27 causes the emer ency piston to operate tomove the emergency slide valve 7 downwardly to its release position. Asthis slide valve is being returned to its release position, thecommunication of the valve chamber 8 and the passage 33, by way of theslide valve port 36 is closed off and communication of the passage 33with the passage 35 is established through the cavity 34 in theemergency slide valve 7 thus, fluid under pressure is discharged fromthe application piston chamber to the atmosphere.

Further, as the emergency slide valve is being returned to releaseposition, the brake cylinder passage is lapped by the emergency slidevalve, thus closing off the supply of fluid under pressure to the brakecylinder l4, and the passage 29 is connected to the atmospheric passage31 through the cavity in the slide valve.

Upon the discharge of fluid under pressure from the application pistonchamber 10, fluid under'pressure in the application slide valve chamberwill cause the application piston 11 tooperate the application slidevalve to release position, in which, the valve 19 will be seated, sothat the flow of fluid under pressure from the reservoir 17 to the brakecylinder, past this valve, is closed ofl, and in which. communicationfrom the application piston chamber to the passage 29 is reestablished,so that fluid under pressure is discharged from the brake cylinder tothe atmosphere in the same man ner as described in connection withtherelease of the brakes after a service application.

If, in effecting an emergency application of the brakes,the applicationpiston sticks or for any other reason fails to operate the applicationslide valve 12 to application position, the emergency piston 6 willoperate the emergency slide valve 7 to its emergency position, closingoff CO111l11L11llCtt tion from the passage 29 to the atmospheric passage31 and uncovering the passage 15 so that fluid under pressure issupplied tion slide valve 12. In releasing the brakes after such anapplication, the emergency portion is operated to release position, and

since the application portion is in release position, fluid underpressure willbe discharged from the brake cylinder 14 to the atmosphereby way of the emergencyportion 1 in the samemanner'as described inconnection with the release of; the 'brakes' after a serviceapplication,

If, in effecting an emergencyapplication,-

the emergency piston 6 should stick or other wise fail to operate theemergency slide valve 7 to emergency posi ion, fluid under pressure willbe su plied to the application piston chamber 10 from the straight airpipe 32, by Way of pipe and passage 35, cavity 34 in the emer enc slidevalve-7 and 3&8-

sage 33, and the pressure of fluid thus supplied to the chamber 10causes the applica tion portion to operate to close the communi cationfrom the application valve chamber 13 to the passage 29 and to supplyfluid under pressure from the reservoir 17, in the same manner asdescribed in connection with the eiiecting of a service application. Therelease 01": the brakes after such an emergency application isaccomplished in the same manner as the release after a application.

t will here be noted that, since the atmospheric connection from thebrake cylinder is controlled byboth the emergency portion 2 and theapplication portion 1, the piston of either one of said portions'mayfail to function to control the brakes in emergency, and the otheronewill function to supply ano release fluid under pressure to and from:

the brake cylinder, thus reducing to a miri mum the possibility of thesupply of flu d under pressure being unintentionallyvented to theatmosphere or closed oil in effecting an emergency application of thebrakes.

\Vhile one illustrative embodiment of the invention has been describedin detail, it is not my intention to limit its scope to that embodimentor otherwise than by the terms valve device-coniprising,an applicationportion and an emergency portion each o said portions being ope atje tosupply i under pressure to the brake cylinder pendently of the other ineitectrng an emer gency application of the brakes, and both portionsbeing operative to es ablish munication through which fluid under sureis discharged from the brake; c i

3; In a fluid pressure brake, the cornbinationwith a brake cylinder, ofan emer- I under brake cyl i i from com:

gency valve j device having an emergency ing an application portionoperative by fluid under pressure supplied through said strai ht airpipe to supply fluid under pressure to said brake cylinder and operative'upon the venting of fluid under pressure from the strr ght air, pipefor releasing fluid under 1 .re from the brake cylinder and alsohav 1gan emergency portion normally establishing conmunication through whichfluid under pr ssur discharged from the brake cylinder, through saidapplication portion, is discharged to the atmosphere.

5. Ina fluid pressure brake, the combination with a straight air pipeand a brake cylinder, of an emergency valve device having an applicationportion operative by fluid pressure supplied through said straight airpipe to supply fluid under pressure to said rake cylinder and operativeupon the ve ing of fluid under pressure from the stre t air pipe forreleasing fluid under pressure IlOlll the brake cylinder and also havingan emer 'ency portion normally establishing connnunication through whichfluid under pressure, discharged from the brake cylinder, through saidapplication portion, is discharged to the atmosphere, said emergencyportion being operative to 'closesaid communication in effecting anemergency application of the brakes.

6. In a fluid pressure brake, the combination with a straight air pipeand a brake cylinder, of an emergency valve device having an aiplicationportion operative by fluid under pressure supplied through said straightair pipe to supply fluid under pressure to said brake cylinder andoperative upon the venting of fluid under pressure from the straight airpipe for releasing fluid under "essure from the brake cylinder and ingan emergency portion normally also ha establishing communication throughwhich fluid under pressure, discharged from the inder, through saidapplication 5 discharged to the atmosphere,

portion,

each of said portions being operative to prevent the flow of fluid underpressure 'ne brake cylinder to the atmosphere in enectmg an emergencyapplication of the 7. In fluid pressure brake, the combination with abrake cylinder, of an emergency valve device hav ng an applicationportion and an emergency portion adapted to establish communication fromsaid brake cylinder to the atmosphere when said portions are in theirrelease positions, either of said portions being operative uponeffecting an emergency application of the brakes for closing saidcommunication and for supplying fluid under pressure to the brakecylinder.

8. In a fluid pressure brake, the combination with a brake cylinder, ofan emergency valve device having an application portion and an emergencyportion adapted to establish communication from said brake cylinder tothe atmosphere when said portions are in their release positions, saidapplication portion being operative to close said communication and tosupply fluid under pressure to the brake cylinder upon effecting aservice and an emergency application of the brakes, and said emergencyportion being operative to close said communication and supply fluidunder pressure to the brake cylinder only upon effecting an emergencyapplication of the brakes.

9. In a fluid pressure brake, the combination with a brake cylinder ofan emergency valve device having an atmospheric passage through whichsaid brake cylinder is adapted to be vented to the atmosphere and havingan application portion and an emergency portion, the operation of eitherof said portions controlling the connecting and disconnecting of saidbrake cylinder with said passage.

10. In a fluid pressure brake, the combination with a brake cylinder, ofan emergency valve device comprising an application portion operative tosupply fluid under pressure to the brake cylinder in eifecting a serviceand an emergency application of the brakes and also comprising anemergency portion operative to supply fluid under pressure to the brakecylinder in effecting an emergency application of the brakes only.

11. In a fluid pressure brake, the combination with a reservoir normallycharged with fluid under pressure and a brake cylinder, of an emergencyvalve device comprising an application portion and an emergency portion,said application portion comprising a valve operative to supply fluidunder pressure from said reservoir to the brake cylinder and pressuresensitive means for operating said valve, and said emergency portioncomprising a valve operative in eflecting an emergency application onlyof the brakes for also supplying fluid under pressure from saidreservoir to the brake cylinder, and pressure sensitive means forcontrolling the operation of the last mentioned valve.

12. In a fluid pressure brake, the combi nation with a brake cylinder,of an emergency valve device having an application portion and anemergency portion normally connecting the brake'cylinder to theatmosphere, said application portion comprising a poppet valve operativeto supply fluid under pressure to the brake cylinder to effect anapplication of the brakes, a slide valve operative to close theconnection from the brake cylinder to the atmosphere, and a pistonsubject to the pressure of fluid for simultaneously operating saidvalves, and said emergency portion comprising a valve operative to alsoclose the connection from the brake cylinder to the atmosphere and toalso supply fluid under pressure to the brake cylinder, and a piston foroperating the last mentioned valve.

In testimony whereof I have hereunto set my hand, this 28th day ofMarch, 1929.

JOSEPH C. MoCUNE.

